A documentary commemorating 100 years of Indian cinema, the film comprises four short films directed by four of India's leading young filmmakers: Karan Johar, Dibakar Banerjee, Anurag Kashyap and Zoya Akhtar.

A source close to the film told Glam Sham: ''Ranbir is all set to join the cast of BT, which releases on May 1. He is the sutradhar [narrator]; his character will tie the four short films into one movie.

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"Bringing him on board was a last-minute decision by the makers, but they believe having him will only add to the charm of the film, which already boasts of quite a few talented actors and directors.

''They are yet to decide how his role will be integrated and who will shoot his part. The makers are working on a couple of innovative ideas. They will have to wrap up soon as it needs to release in May."

A hugely in-demand star following the success of Barfi!, Kapoor is currently shooting for Abhinav Singh Kashyap's Besharam and is anticipating the May release of Yeh Jawaani Hai Deewani .

Bombay Talkies marks 100 years since the release of India's first motion picture Raja Harishchandra in 1913.